What inspires the music director in Go Set a Watchman to change the way the congregation sings the Doxology?

In Chapter 7 of Go Set a Watchman, Jean Louise's uncle, Dr. Finch, asks the music director at the Methodist church why the way in which the Doxology is sung has been sped up. The music director, Herbert, explains that he took a course on "what was wrong with Southern church music" from a New Jersey teacher. The northern music teacher suggested that the church, based in Alabama, "pep up" their singing and get rid of some Southern hymns. Dr. Finch responds, “Apparently our brethren in the Northland are not content merely with the Supreme Court’s activities. They are now trying to change our hymns on us.”

Dr. Finch's comment is a reference to the 1954 Supreme Court case Brown v. Board of Education, which declared that segregated schools were unconstitutional. The south at the time resented northern interference in what they deemed were local affairs, and the matter of the Doxology is a humorous reference to the idea that the southern way of life is changing at the time the novel takes place.